Capítulo 5. Zend_Filter

5.1. Zend_Filter

5.1.1. Introduction

Zend_Filter provides a library of static methods
for filtering data. For input filtering, you should use Seção 5.2, “Zend_Filter_Input” instead, because it provides a framework for
filtering input using the methods provided by this class. However, because
Zend_Filter_Input is designed primarily for arrays,
Zend_Filter can be useful for filtering scalars, because
it behaves like PHP's string functions: